全文获取类型
收费全文 | 332篇 |
免费 | 119篇 |
国内免费 | 85篇 |
专业分类
化学 | 133篇 |
晶体学 | 12篇 |
力学 | 43篇 |
综合类 | 28篇 |
数学 | 77篇 |
物理学 | 243篇 |
出版年
2024年 | 3篇 |
2023年 | 20篇 |
2022年 | 20篇 |
2021年 | 17篇 |
2020年 | 11篇 |
2019年 | 10篇 |
2018年 | 13篇 |
2017年 | 16篇 |
2016年 | 11篇 |
2015年 | 11篇 |
2014年 | 27篇 |
2013年 | 25篇 |
2012年 | 29篇 |
2011年 | 16篇 |
2010年 | 29篇 |
2009年 | 26篇 |
2008年 | 28篇 |
2007年 | 20篇 |
2006年 | 24篇 |
2005年 | 11篇 |
2004年 | 14篇 |
2003年 | 15篇 |
2002年 | 11篇 |
2001年 | 7篇 |
2000年 | 13篇 |
1999年 | 5篇 |
1998年 | 12篇 |
1997年 | 7篇 |
1996年 | 3篇 |
1995年 | 7篇 |
1994年 | 10篇 |
1993年 | 4篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 9篇 |
1985年 | 10篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 6篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1962年 | 2篇 |
排序方式: 共有536条查询结果,搜索用时 15 毫秒
191.
选取青海大通地区一次地闪过程的雷声信号,利用信号处理理论,得到了观测点雷声的频谱;依据声波在大气中传播的理论,计算了大气对雷声传播的吸声系数,分析了吸声系数随环境因素的变化,结果表明:闪电发生距离、大气湿度和温度是影响雷声传播的主要因素.在一定闪电距离和大气环境下,吸声系数随频率的增加而增大;频率小于100 Hz的雷声衰减很慢,空气相对湿度和温度对其吸声系数的影响也比较小,在一定距离内的衰减可以忽略;频率大于500 Hz的高频信号吸声系数较大,并且随相对湿度的增加而快速递增;吸声系数随温度呈非单调变化,频
关键词:
雷声传播
大气吸收
衰减 相似文献
192.
Investigation of inter-molecular hydrogen bonding in the binary mixture (acetone + water) by concentration dependent Raman study and ab initio calculations 下载免费PDF全文
This paper reports that vibrational spectroscopic analysis on hydrogen-bonding between acetone and water comprises both experimental Raman spectra and ab initio calculations on structures of various acetone/water complexes with changing water concentrations. The optimised geometries and wavenumbers of the neat acetone molecule and its complexes are calculated by using ab initio method at the MP2 level with 6-311+G(d,p) basis set. Changes in wavenumber position and linewidth (fullwidth at half maximum) have been explained for neat as well as binary mixtures with different mole fractions of the reference system, acetone, in terms of intermolecular hydrogen bonding. The combination of experimental Raman data with ab initio calculation leads to a better knowledge of the concentration dependent changes in the spectral features in terms of hydrogen bonding. 相似文献
193.
Ultrahigh Harmonic Generation from an Atom with Superposition of Ground State and Highly Excited States 总被引:1,自引:0,他引:1 下载免费PDF全文
We investigate the high-order harmonic generation from an atom prepared in a superposition of ground state and highly excited state. When the atom is irradiated by an ultrashort pulse, the cutoff position of the plateau in the harmonic spectrum is largely extended compared with the case that the atom is initially in the ground state. The physics of the extension of the high-order harmonic plateau can be interpreted by the spatial structure of the atomic initial wave packet. We can optimize the generation of high-order harmonics by substituting the excited state for a particular coherent superposition of some highly excited states to form a spatially localized excited wave packet. 相似文献
194.
195.
196.
Surface waves(SWs) are a special form of electromagnetic waves that travel along the boundary between a metal and a dielectric. The special optical properties of SWs render them very attractive in applications, such as subdiffractional lithography, novel biochemical sensors, and ultrafast integrated circuitries. Herein, we present a review of our recent progress in excitation and manipulation of terahertz SWs due to interference or coupling between a pair of slit resonators in metasurfaces, showing the ability to devise ultrathin and compact plasmonic components. 相似文献
197.
198.
Theaerobicoxidationofethylenetoacetaldehydeandterminalolefinstocorrespondingalkan 2 onescat alyzedbypalladium(II)andcopper(IIorI)saltsarecol lectivelyknownasWackeroxidations (Scheme 1) .1Theyareveryimportantinbothsyntheticandindustrialchem istry .Treatmentoft… 相似文献
199.
本文报道证明长链分子在不良溶剂中发生簇集的实验事实.长链水杨酸烷基酯在二甲基亚砜-水(DMSO-H2O)和乙二醇-水(EG-H2O)混合溶剂中的荧光光谱分布以及荧光量子产率与短链水杨酸烷基酯的显著不同,这些差别可以用长链分子发生簇集来加以解释. 相似文献
200.
Crystal structures, phase relationships, and magnetic phase transitions of RsM4 compounds (R = rare earths, M = Si, Ge) 下载免费PDF全文
Our recent studies of the crystal structures, phase transitions, and magnetic properties of intermetallic compounds RsM4 (R = rare earths; M = Si, Ge) are reviewed briefly. First, crystal structures, phase relationships, and magnetic prop- erties of several 5:4 compounds, including Nd5 Si4-xGex, Pr5 Si4_xGex, Gds-xLaxGe4, La5 Si4, and Gd5 Sn4, are presented. In particular, the canted spin structures as well as the magnetic phase transitions in PrsSi2Ge2 and PrsGe4 investigated by neutron powder diffractions and small-angle neutron scattering are reviewed. Second, the crystal structures and magnetic properties of the most studied compounds Gds(Si,Ge)4 are summarized. The focus is on the parent compound GdsGe4, which is an amazing material exhibiting magnetic anisotropy, angular dependent spin-flop transition, metastable magnetic response, Griffiths-like phase, thermal effect under pulsed fields, antiferromagnetic and ferromagnetic resonances, pro- nounced effects of impurities, and high-field induced magnetic transitions. 相似文献